1. Cooling: The cutting fluid is poured in the cutting zone. By cutting the heat conduction, convection and vaporization of the cutting fluid, the heat on the workpiece and the tool can be quickly taken away for cooling. Due to the cooling effect of the cutting fluid, the cutting temperature can be lowered, the service life of the tool can be improved, the thermal expansion of the workpiece and the tool can be reduced, and the machining accuracy can be improved.
2. Lubrication. The cutting fluid penetrates into the lubricating film between the cutter and the chip and the surface of the workpiece during the machining process to provide lubrication. However, due to the high pressure between the above surfaces during cutting and the high temperature, the lubricating effect is also related to the type of cutting fluid used and whether or not extreme pressure additives are added. In CNC engraving, the most commonly used cutting fluid is No. 5-7 oil. The most important function is cooling, and the lubrication effect is small.
3. Assist in chip removal. In the CNC engraving process, the cutting fluid is poured to remove the chips generated during the cutting process, preventing secondary cutting and affecting the machined surface.
